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| bio | website | |
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| visits | member for | 1 year, 4 months |
| seen | yesterday | |
| stats | profile views | 323 |
Hey all-just an undergrad trying to figure out what's going on. Don't be a stranger :D!
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May 15 |
comment |
Counterexample to upper continuity i think you want intersections instead of unions yeah? |
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May 7 |
comment |
Classification of local Artin (commutative) rings which are finite over an algebraically closed field. Well since it's finite, it can be embedded/'found' in $\mathbb{A}^n$, and if my definitions are right, local artin means just one prime/maximal ideal, corresponding to WLOG the origin in $\mathbb{A}^n$. so up to isomorphism you can write it as $k[x_1, ... x_n]/I$ where $\sqrt{I} = (x_1 ... x_n)$. |
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May 7 |
answered | Does $\frac 1{z^2+1}$ have a primitive on $\mathbb C-\{i,-i\}$? |
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Apr 16 |
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Looking for a “prime-ish” family of subsets you ask that the members of $\mathscr{F}$ be closed in the title but not in the question...so how about all subsets? or, in fact any collection closed under finite intersection + the emptyset |
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Apr 8 |
answered | Let $a \in \mathbb{F}$. Prove that if $0 < k < n$, then $a^k \neq 1$ |
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Apr 6 |
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Help with a nonhomogeneous function for a boundary value problem well, $y'$ is constant, i.e. $y = ax + b$, if this has at least two zeroes then it's the zero function (a piecewise linear function isn't differentiable at the peaks) |
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Apr 6 |
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De Rham Cohomology of Product of Manifold with an Open Interval this is roughly speaking the 'universal' case of homotopy invariance, and here's a proof: math.harvard.edu/~s.lau/230a/… |
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Apr 3 |
revised |
Will $i^*$ pull back injectives to injectives? added 350 characters in body |
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Apr 2 |
answered | True or False $W_i\cap \Sigma_{i\neq j}W_j=\Sigma_{i\neq j}( W_i\cap W_j)=\cap W_i$ |
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Mar 11 |
answered | If $U\nsubseteq W$, then $\text{Ann}(W)\nsubseteq\text{Ann}(U)$ |
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Mar 7 |
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Please help me prove Cantelli's inequality Have you tried googling this? I found: cse.buffalo.edu/~hungngo/classes/2011/Spring-694/lectures/…, which has it top of second page. Hope that helps! :) |
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Mar 7 |
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Fermat's theorem (stationary points) of higher dimensions Can't you just apply the one variable case in every direction $v$, deduce all partials $\partial_v$ vanish, hence $df$ is the 0 transformation? |
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Mar 5 |
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Will $i^*$ pull back injectives to injectives? I'm happy with all of this, but I can't see the connection with the question. What did you have in mind? Thanks :D |
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Mar 5 |
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Is E[|X+Y|]\leq E[|X| ] + E[|Y|] @copper.hat seconded |
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Mar 5 |
answered | Is E[|X+Y|]\leq E[|X| ] + E[|Y|] |
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Mar 5 |
revised |
Will $i^*$ pull back injectives to injectives? added 73 characters in body |
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Mar 5 |
asked | Will $i^*$ pull back injectives to injectives? |
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Feb 25 |
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Prove $\lim \limits_{x \to\infty } \frac{f(x)}{x}=0$ and $f$ differentiable implies $ \lim \limits_{x \to\infty } \inf |f'(x)|=0 $ @User - with Will's bound, roughly speaking $f$ grows at least linearly, since for $f'(x) = \epsilon$ it would be growing like a line...now $f(x)/x$ is measuring how fast $f$ grows compared to a linear function... |
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Feb 23 |
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Does every element of tensor product look like this? the proof was awesome, writing 'the end' was possibly 'awesomer' :) |
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Feb 5 |
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Problems regarding $\{x_n \}$ defined by $x_1=1$; $x_n$ is the smallest distinct natural number such that $x_1+…+x_n$ is divisible by $n$. Does $x_n$ distinct mean it's not equal to "$x_{n-1}$" or "any of $x_1, \ldots, x_{n-1}$"? |
